Remove some Profile-keyed factory boilerplate: management omnibox preference push_messaging.

chrome/browser/extensions/api/preference/preference_api.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/preference/preference_api.h"
 
 #include <map>
 #include <utility>
 
+#include "base/lazy_instance.h"
 #include "base/memory/singleton.h"
 #include "base/stl_util.h"
 #include "base/stringprintf.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/api/preference/preference_api_constants.h"
 #include "chrome/browser/extensions/api/preference/preference_helpers.h"
 #include "chrome/browser/extensions/api/proxy/proxy_api.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_prefs_scope.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 294 matching lines @@
   }
 }
 
 PreferenceAPI::~PreferenceAPI() {
 }
 
 void PreferenceAPI::Shutdown() {
   ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
 }
 
+static base::LazyInstance<ProfileKeyedAPIFactory<PreferenceAPI> >
+g_factory = LAZY_INSTANCE_INITIALIZER;
+
+// static
+ProfileKeyedAPIFactory<PreferenceAPI>* PreferenceAPI::GetFactoryInstance() {
+  return &g_factory.Get();
+}
+
 void PreferenceAPI::OnListenerAdded(const EventListenerInfo& details) {
   preference_event_router_.reset(new PreferenceEventRouter(profile_));
   ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
 }
 
 PreferenceFunction::~PreferenceFunction() { }
 
 bool PreferenceFunction::ValidateBrowserPref(
     const std::string& extension_pref_key,
     std::string* browser_pref_key) {
@@ skipping 195 matching lines @@
   if (!ValidateBrowserPref(pref_key, &browser_pref))
     return false;
 
   ExtensionPrefs* prefs =
       ExtensionSystem::Get(profile_)->extension_service()->extension_prefs();
   prefs->RemoveExtensionControlledPref(extension_id(), browser_pref, scope);
   return true;
 }
 
 }  // namespace extensions